Cisco WS-C2980G-A Software Guide - Page 127
Setting the MISTP-PVST+ Mode or MISTP Mode
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Chapter 7 Configuring Spanning Tree Using MISTP-PVST+ or MISTP Table 7-5 MISTP Mode Default Configuration (continued) Feature Hello time Forward delay time Default Value 2 sec 15 sec Setting the MISTP-PVST+ Mode or MISTP Mode If you enable MISTP in a PVST+ network, you must be very careful to avoid bringing down the network. This section explains how to enable MISTP or MISTP-PVST+ on your network. Caution If you have more than 4500 VLAN ports that are configured on your switch, your network could crash if you change from MISTP to either PVST+ or MISTP-PVST+ mode. To avoid losing connectivity, reduce the number of configured VLAN ports on your switch to no more than 4500. Caution If you are working from a Telnet connection to your switch, the first time that you enable MISTP-PVST+ or MISTP mode, you must do so from the switch console. Do not use a Telnet connection through the data port or you will lose the connection to the switch. Once you map a VLAN to an MISTP instance, you can Telnet to the switch. To change from PVST+ to MISTP-PVST+ or MISTP, perform this task in privileged mode: Task Set a spanning tree mode. Command set spantree mode {mistp | pvst+ | mistp-pvst+} This example shows how to set a switch to MISTP-PVST+ mode: Console> (enable) set spantree mode mistp-pvst+ PVST+ database cleaned up. Spantree mode set to MISTP-PVST+. Warning!! There are no VLANs mapped to any MISTP instance. Console> (enable) You can display VLAN-to-MISTP instance mapping information propagated from the root switch at runtime. This display is available only in the MISTP or MISTP-PVST+ mode. When in the PVST+ mode, use the optional keyword config, to display the list of mappings configured on the local switch. Note MAC addresses are not displayed when you specify the keyword config. To display spanning tree mapping, perform this task in privileged mode: Step 1 Step 2 Task Set spanning tree mode to MISTP. Show spanning tree mapping. Command set spantree mode mistp show spantree mapping [config] 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-31
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